In a small bedroom the wardrobe is rarely the problem. The problem is what has to happen in front of it: a door swinging, a drawer pulling out, a person standing there while the bed is a step behind them. Solve the space in front and the wardrobe itself gets easy, which is why the first question here is about the floor rather than the cabinet.
Keep the wardrobe 24" (610 mm) deep if the room allows, because that is what a hanger needs. If it does not, going shallow means turning the rail so clothes face sideways, which costs capacity and access rather than making the wardrobe useless. Run the cabinet to the ceiling, since the top foot of a small room is the cheapest storage in the house. And spend real thought on the doors, because in a tight room the swing is the constraint that decides everything else.
Start with the floor, not the wall
Draw the room and mark three things before choosing a wardrobe: where the bedroom door swings, where the bed sits, and where you stand to get dressed. In a small room those three overlap, and the wardrobe has to fit around the overlap rather than into the leftover wall.
Three placements that work when the obvious one does not:
The wall behind the door. A door that opens against a wall leaves that wall permanently useless for anything you need to reach, but perfectly good for a shallow wardrobe you open when the door is closed.
The wall at the foot of the bed. Usually the longest uninterrupted stretch, and the one people leave empty out of habit.
Over the bed head. A bridging unit with cabinets either side of the bed and a run across the top. It uses the wall nobody stands in front of, and the cabinets above need to be shallow enough not to loom.
The placement to avoid, if there is any choice, is a deep wardrobe directly facing the bed with a metre of floor between them. That arrangement makes the room feel like a corridor and puts the doors where you cannot open them fully without climbing on the mattress.
How shallow can a wardrobe be
The honest answer has a cliff in it rather than a slope. Down to about 20" a wardrobe works normally, slightly tight, with clothes brushing the back and the doors. Below that, the rail can no longer run across the wardrobe, because a hanger will not fit, so it has to run along it instead and the garments face sideways.
That change has consequences worth knowing before you commit:
Capacity per foot of wall drops sharply, since clothes are now stored front to back rather than shoulder to shoulder.
Access gets worse. You look at the sleeve of the first garment and have to slide the rest along to see anything.
It still beats nothing.A 14" deep run on a wall that would otherwise be empty holds real clothes, and it is a perfectly reasonable answer in a room with no better wall.
The alternative in a shallow space is to give up hanging altogether on that wall and use it for shelves and drawers, which need only 12 to 16". Fold what you can, hang what you must, and put the hanging where the depth exists. The closet dimensions guide covers the depth argument in full.
Doors: the real constraint
Door
What it needs
What it gains
What it costs
We build it?
Hinged
Swing room in front, roughly the width of the door itself
The whole opening is available at once, and the doors are cheap and repairable
The swing, which in a small room is the entire problem
Yes, single or as a pair
Bi-fold
About half the swing of a hinged door of the same width
Most of the opening, in half the projection
More hardware, a centre fold that collects fingers, and a narrower clear opening
Yes
Sliding
No swing at all, but the doors overlap so one panel is always covered
Nothing projects into the room. The reason it exists
You can never open more than half the wardrobe, and the track takes depth
No. We build hinged and bi-fold
No door
Nothing
Cheapest, fastest to use, and the room feels larger with an open bay in it
Everything is on display, and dust settles on the clothes
Yes, an open bay is just a cabinet without fronts
Being direct about the last column: we build hinged and bi-fold doors, and we do not build sliding wardrobes. If a sliding front is what your room needs, that is a different supplier for the doors, and the cabinetry behind them is still something we can make.
The case for sliding is genuine in a room where nothing can project, and the case against it is rarely made: a sliding wardrobe can never be more than half open, so you are always looking at half your clothes, and the track and overlap eat depth from a wardrobe that was already shallow. In a small room those two costs are not trivial.
If you go hinged, narrow doors swing less far into the room than wide ones, and a pair on a wide opening beats a single wide door for exactly that reason. Door width is also what loads a hinge, which is a second argument for the same choice, covered in the hinge guide.
Go to the ceiling
A freestanding wardrobe stops around seven feet and leaves the rest of the wall as a dust shelf for suitcases. In a small bedroom that gap is the cheapest storage available, and taking a fitted run all the way up typically adds a full-width shelf without occupying any more floor.
Two practical notes. Put the things you touch twice a year up there, since it is a step-stool zone by definition. And a run that meets the ceiling has to cope with a ceiling that is not flat, which is what scribing and fillers are for. That is one of the clearer arguments for fitted over freestanding in a small room, and the comparison covers the rest of it.
What to put inside when there is not much of it
A small wardrobe rewards a different split from a large one, because every centimetre is contested:
Double hang wherever you can. Two rails on the same stretch of wall hold twice as much, and most clothing is short enough for it. In a small wardrobe this is not an optimisation, it is the difference between fitting and not.
One short section of long hang, sized to the coats you own. Long hang is the most expensive storage in a wardrobe per garment.
Drawers rather than shelves at the bottom. A drawer in a shallow wardrobe is reachable; a low shelf means kneeling and looking sideways into a dark space.
Nothing on the floor. Floor storage in a wardrobe is where things go to be forgotten, and a drawer at the same height is better in every way.
None of it is permanent. The inside sits on the 32 mm hole grid, so the arrangement can change as your clothes do, which matters more in a small wardrobe than a large one because there is no slack.
Draw the swing before the wardrobe
Put the room in with the bed and the door where they really are, then place the wardrobe. You can see whether a hinged door clears the bed, whether a shallower run buys back the walkway, and what the ceiling-height version adds, before anything is built.
About 24 inches (610 mm) is what a coat hanger needs, and down to roughly 20 inches a wardrobe still works normally, if slightly tight, with clothes brushing the back and the doors. Below that the rail can no longer run across the wardrobe and has to run along it instead, so garments face sideways. That costs capacity per foot of wall and makes browsing harder, since you see one sleeve at a time, but it is still real storage on a wall that would otherwise hold nothing. The alternative in a shallow space is shelves and drawers, which need only 12 to 16 inches.
Are sliding or hinged wardrobe doors better for a small room?
Sliding doors project nothing into the room, which is their entire purpose and a real advantage where a bed is close. The costs are rarely mentioned: a sliding wardrobe can never be more than half open, so you always see half your clothes, and the track and door overlap take depth from a wardrobe that may already be shallow. Hinged doors give you the whole opening at once and are cheaper and easier to repair, and narrow doors in a pair swing much less far into the room than one wide door. We build hinged and bi-fold rather than sliding.
Do you make sliding wardrobe doors?
No. Our wardrobes take hinged doors, singly or in pairs, and bi-fold doors, which need about half the swing of a hinged door of the same width. Sliding gear is not something we supply. If a sliding front is genuinely what your room requires, the doors are a different purchase, and the cabinetry behind them is still something we can build to your dimensions. It is better to know that before you design the room around a front we do not make.
Where should a wardrobe go in a small bedroom?
Work from the floor rather than the wall. Mark where the bedroom door swings, where the bed sits and where you stand to get dressed, because in a small room those three overlap and the wardrobe has to fit around the overlap. Three placements that often work: the wall behind the bedroom door, which is useless for anything you need constant access to but fine for a wardrobe; the wall at the foot of the bed, usually the longest uninterrupted stretch; and a bridging unit over the bed head. Avoid a deep wardrobe directly facing the bed across a metre of floor.
Should a wardrobe go all the way to the ceiling?
In a small bedroom, almost always. A freestanding wardrobe stops around seven feet and leaves the rest of the wall as a dust shelf, and taking a fitted run to the ceiling typically adds a full width shelf without using any more floor, which is the cheapest storage in the room. Put the things you need twice a year up there, since it is a step-stool zone. The catch is that ceilings are rarely flat, so the run needs scribing or a filler at the top, which is one of the clearer arguments for fitted over freestanding.
How do you fit more into a small wardrobe?
Double hang wherever the clothes allow, since two rails on the same stretch of wall hold twice as much and most garments are short enough for it. Keep long hang to one short section sized to the coats you actually own, because it is the most expensive storage per garment. Use drawers rather than low shelves at the bottom, since a drawer is reachable while a low shelf means kneeling and peering sideways into the dark. And keep the floor of the wardrobe clear, because anything left there is forgotten.
